Add configure options to php7 package

  - This adds a sane number of configure options to get Composer working
  - Many of these options are requirements for other PHP projects as well

packages/php7.rb

@@ -6,9 +6,16 @@ class Php7 < Package
   source_sha1 'c74c920256b9c6873bae696fbb0ec14a02dc8495'  # source tarball sha1 sum
 
   depends_on 'libxml2'
+  depends_on 'openssl'
 
   def self.build                                                  # self.build contains commands needed to build the software from source
-    system "./configure"
+    system "./configure \
+      --with-curl \
+      --with-gd \
+      --enable-mbstring \
+      --with-openssl \
+      --with-pcre-regex \
+      --with-zlib"
     system "make"                                                 # ordered chronologically
   end